Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quais notas têm estudantes menores que 430 e um API de 2007 de 510?
 ###Tabelas: CREATE TABLE schools (schools_id AUTO_INCREMENT PRIMARY KEY, School name VARCHAR, address VARCHAR, students INT, grades VARCHAR, 2007 API INT) CREATE TABLE mutant_cultivars (mutant_cultivars_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, "Inventor" VARCHAR, Marketed as VARCHAR, Mutated From VARCHAR, Assignee VARCHAR, Habit VARCHAR, Pattern VARCHAR, Earlier VARCHAR, Color VARCHAR, Plant Patent Number VARCHAR) CREATE TABLE managerial_head_coach_changes (managerial_head_coach_changes_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Outgoing manager VARCHAR, Manner of departure VARCHAR, Date of vacancy VARCHAR, Incoming manager VARCHAR, Date of appointment VARCHAR) CREATE TABLE 2011_classic_superbike_practice_times_and_leaderboard (2011_classic_superbike_practice_times_and_leaderboard_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Rider VARCHAR, Sat 20 Aug VARCHAR, Mon 22 Aug VARCHAR, Tues 23 Aug VARCHAR, Wed 24 Aug VARCHAR, Thurs 25 Aug VARCHAR, Fri 26 Aug VARCHAR, Sat 27 Aug VARCHAR, Mon 29 Aug VARCHAR, Wed 31 Aug VARCHAR) CREATE TABLE reset_points (reset_points_id AUTO_INCREMENT PRIMARY KEY, # INT, Player VARCHAR, Country VARCHAR, Points INT, Reset points INT, Events INT)  
SELECT grades FROM schools WHERE students < 430 AND 2007 API = 510